Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2006, Vol. 29 ›› Issue (1): 60-63.doi: 10.13190/jbupt.200601.60.huangxj

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A Three-Phase Single-Switch Fly-Back Rectifier with Lossless Isolated Snubber

HUANG Xiao-jun, GONG Jian, HUANG Ji-qing   

  1. School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2005-03-20 Online:2006-02-28 Published:2006-02-28
  • Contact: HUANG Xiao-jun E-mail:huangxiaojun@263.net

Abstract:

A new three-phase flyback rectifier with loss recovery snubber is presented. A discontinuous current mode (DCM) operation with constant duty ratio allows achieving unity power factor. The principal characteristics are the very simple topology with only one switch, simple control scheme without input current feedback, and galvanic isolation between the input and output. By using a resonant energy recovery snubber, the switch can achieve zero voltage state (ZVS) at the turn off, and can also be protected against over-voltage caused by the leakage of transformers. Meanwhile, the switching loss is evidently reduced and the efficiency is greatly improved. There is not additional control circuit in the snubber. Simulation and experiment results confirm the validity of circuit, showing sinusoidal input currents and a ripple-less output voltage. The topology can be used as wireless base station power supply.

Key words: power factor correction, fly-back, snubber, rectifier

CLC Number: